Cylinder-boring device



H. J. HARTIG.

CYLINDER BORING DEVICE.

APPLICATION FILED NEIL/0.1920.

1 ,4Q4,203, Patented Jan. 24, 1922.

PATENT OFFICE.

HENRY J. HARTIG, OF BROOKLYN, NEW YORK.

. CYLINDER-BORING DEVICE.

Specification of Letters Patent.

Patented Jan. 24., 1922.

Application filed February 4, 1920. SerialfNo. 356,226.

T 0 all. whom- 2'15 may concern Be it known that I, HENRY J. HARTIG, a citizen of the United States, and a resident of the borough of Brooklyn, county of Kings, city'and State of New York, have invented a new and useful Improvement in Cylinder-Boring Devices, of which the following is a full, clear, and exact description.

My invention relates to improvements in devices for boring out cylinders, and is especially adapted for boring out the cylinders of engines, although the device can be used for re-boring anycylind'er if desired. It is well known that it is rather frequently necessary to rebore the cylinder of internal combustion engines, and it is also often desirable to re-bore or bore other cylinders, and the object of my invention is to produce a strong, simple and inexpensive device by which such work can be easily and quickly accomplished,

My invention is further intended to produce a device in which aflat body or cutter-bar is held in a simple form of packing and guide,

the latter being expansible at one end, and cylindrical in shape, so that it can be made to accurately fit a cylinder, and at the same time it will hold the body or cutter-bar so that it will not wobble or chatter, and will be held in position to .bore accurately. In carrying out my invention I use a cylindrical form of two-part packing and guide which fits snugly in the cylinder to be bored, and which is of softer material than the cylinder operated on, so that there will be no danger of scratching the cylinder. The material may be hard wood, hard rubber, fibre, or any good firm material which is not too hard. The packing carries the body or cutter-bar which projects from the outer endthereof, so that it can be gripped by the wrench or other means of operating it, and the cutting edges of the body or cutter-bar project slightly from opposite sides of the packing and guide so as to properly engage the cylinder wall. The expansible end of the packing and guide can be adjusted by a very simple screw attachment, and the whole structure is simple, cheap, and strong, and therefore well adapted to quickly and accurately bore cylinders.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar reference characters indicate corresponding parts in all the views.

Figure 1 is a side elevation of the tool or device embodying my invention.

Figure 2 is a longitudinal section on the line 2-2 of Figure 1.

Figure 3 is a cross section of the device on the line 3--3 of Figure 1.

Figure 4 is an inside end-view of the device, and

Figures 5 and 6 are an elevation and cross section, respectively, of a slight modification of the invention.

In carryin out my invention I use a packing and guide formed of two nearly semicylindrical parts 10 which are adapted to clamp the body or cutter-bar 15 between them, and when the cutter-bar is in place the packing and guide is cylindrical, and its lower or expansible end presently referred to, must form an accurate circle in cross section. The packing is hollow at its inner end as shown at 11, and is slit longitudinally at intervals as shown at 12, thus forming a series of segments 13 which can be expanded slightly, and which thenaturalspring of the material permits. The inner sides of the segments 13 are beveled as shown at lt in Figure 2, for the purpose of providing for expansion, as presently'described. The body or cutter-bar 15 which clamps between the sections 10 of the packing projects from the. outer end as shown at 15?, so that a tool, as a wrench or the like, can be applied to it in order to turn the device, andthe body or cutter-bar projects very slightly from opposide sides, and is beveled as shown in Figure 3, to form two cutting edges 16 which are diagonally opposite each other, and which projects slightly from the packing, this projection being sufficient to re-bore the cylinder to the desired extent. The outer end of the cutter-bar is" also preferably pierced as shown at 17, to facilitate the attachment of certain kinds of handles or shanks for turning, and the two parts 10 and the cutter-bar 15, are clamped together by cross-bolts 18, the heads 19 and nuts 20 of which are countersunk in the member 10.

At the inner hollow end of the packing 10 is a slide block 21 which fits snugly in the holder, and the outer portion of which is beveled as shown at 22 to fit the beveled parts let of the segments 13. A bolt 23 extends longitudinally through the block 21 and screws into the inner end of the body or cutter-bar 15.

V'It will be seen, therefore, that by screwing in the bolt 28, the block 21 and its beveled part 22 will be drawn inward, and the part 22 will have a wedge action uponthe bevel parts 14 and the segments 13, thus expand ing them, and this expansion can be regulated, obviously, so that the diameter of the expanded part will fit the cylinder nicely; The tool is now ready for use, and can be inserted in the cylinder and twisted around in the customary manner sbthat the cutting edges 16 of the body or cutter-bar will cut the walls of the cylinder to the desired ex tent, and as the tool is accurately guided by its packing, the walls will be cut with sufficient accuracy. a A In practice I have generally used the body or cutter-bar 15 with the cutting edges l6 formed directly thereon as described, but ohviously the body or cutter-bar can be provided with expansible bits if desired, so that after a cylinder has been re-bored once,'it can be easily bored repeatedly with the same tool by expanding the cutting bits.

This expansible cutter can obviously be made in very many welleknown ways and in'Figures 5 and; 6 I have shown one way of expanding the cutters. As here illustrated, the body or cutter-bar 15 and its packing and guideare used as describechbut the cutter-bar has the holesQb through which the clamping rbolts 18 extend, elongated so as to provide for longitudinal movement, and in the side edges of the cutter-bar are 'bits 25 which have their outer ends beveled as shown at "26 and wedging against corresponding Walls 2% of the cutterbar, the bits being held in recesses in the edges of the cutter-bar as shown. The bits.

25'can be heldby transverse bolts 28, suitably countersunk in the members 10, and

= to provide for lateral movement. the holes 29. through which the bolts 28 extend, are elongated laterally. With this construction it will be seen that when thc'block 21 isforced inward to expand the end of the packing, the body or cutter-bar15 will also be drawn towards the block 21, both parts moving slightly, and the walls 27 wedging on the walls 26 of the bits 25-will force the bits outward. These are heldagainst longitudifecting the invention.

nal movement by, the cross-abutments" 30. The details of this expansible arrangement are not claimed, and the structure shown in Figures 5 andfiis simply to illustrate the fact that the cutter may be expansible if'desired, and as stated, other forms of 'expanding the cutter can be used without af- It willbe observed-that this invention is different from most expansible reamers and tools of like nature, in that the packing for the cutting tool is expansible and'adapted to fit snugly in the. hole which is being reborethso as to preventthe tool from wobbling, while the tool itself is set to cut the bore to thedesired diameter.

{,1 claim l j l; A cylinder boring substantially flat body, cutters mounted to project beyondthe side edgesthereof, a substantially semi-cylindrical packing of softer material than the body mounted on each side face of and projecting beyond thelforward end of the body and-having a diameter substantially that of the cutters, and means carried, in said projecting ends-jto expand the packings 2. Afcylinderboring; tool comprising; a r V substantially flat body having cutters projecting beyond theside edges thereof, a sub into the body or cutter-bar.

E HENRYYJ. I-IARTIG.

I Vitnesses: 1 I

THEODORE 'V, MAR I CARL W. THoMPsoN.

' tool comprising a a screw extending through said member and 

